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Use of Special Purpose Entities and Variable Interest Entities - Financing VIEs Securitized Debt by Contractual Maturity (Details) $ in Thousands | Jun. 30, 2018 USD ($) securitization | Dec. 31, 2017 USD ($)
--- | --- | ---
Variable Interest Entity [Line Items] |  |
Total | $ 215,580 |
Carrying value | 61,026 | $ 81,537
Financing VIE |  |
Variable Interest Entity [Line Items] |  |
Within 24 months | 31,827 | 53,089
Over 24 months to 36 months | 0 | 0
Over 36 months | 33,262 | 33,350
Total | 65,089 | 86,439
Discount | (3,615) | (4,232)
Debt issuance cost | (448) | (670)
Carrying value | $ 61,026 | $ 81,537
Residential mortgage loans held In securitization trusts net |  |
Variable Interest Entity [Line Items] |  |
Number of securitizations completed to date | securitization | 4 |
Number of securitizations, consolidated, accounted for as permanent financing | securitization | 3 |

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- Definition Long-term Debt, Maturities, Repayments of Principal in Next Rolling Twenty Four Months + References No definition available. + Details
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- Definition Number of Securitizations Completed to Date + References No definition available. + Details
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- Definition The value of the collateral (typically cash) that the entity receives in a financing transaction in exchange for securities lent. This item represents a liability in the financial statements of the lender of the securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 25 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109249708&loc=d3e113275-111724 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(i)(A)(ii)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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